How big of a water heater do I need for walk-in tub?

The size of the water heater needed for a walk-in tub typically depends on the tub's capacity and the temperature of the incoming cold water. Most walk-in tubs require between 40 to 80 gallons of water for a full soak. To ensure you have enough hot water, it's advisable to have a water heater with at least a 50-gallon capacity for standard use, but larger tubs may require a 75-gallon or more unit. Additionally, consider the recovery rate of the heater to ensure you can refill it quickly if needed.